Equation 8 · A Strained Crystal Is a Designer Spacetime
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Turning that mathematics into a device means choosing a crystal whose tilt sits close to the critical value already, at rest, so that an achievable amount of strain can push it the rest of the way across. Push too little strain onto a crystal whose tilt starts far below 1 and the crossing never arrives before the crystal’s elastic limit does; start from a crystal whose tilt is already far above 1 and the crossing needs a strain the lattice cannot survive. The paper’s candidate is the tungsten ditelluride and molybdenum ditelluride family, sitting close enough to the type-I/type-II boundary that density-functional calculations already show strain can drive the transition, with the…
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Turning that mathematics into a device means choosing a crystal whose tilt sits close to the critical value already, at rest, so that an achievable amount of strain can push it the rest of the way across. Push too little strain onto a crystal whose tilt starts far below 1 and the crossing never arrives before the crystal’s elastic limit does; start from a crystal whose tilt is already far above 1 and the crossing needs a strain the lattice cannot survive. The paper’s candidate is the tungsten ditelluride and molybdenum ditelluride family, sitting close enough to the type-I/type-II boundary that density-functional calculations already show strain can drive the transition, with the tungsten-doped compound Mo _{0.91} W _{0.09} Te _2 as the concrete lead, because it is the one member of that family on which strain has actually been delivered and measured in the laboratory [ 3 ] .
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